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authorRoland McGrath <roland@gnu.org>1996-07-21 11:09:45 +0000
committerRoland McGrath <roland@gnu.org>1996-07-21 11:09:45 +0000
commit9e0f40723e678100cc556776919a4cbf69770bc9 (patch)
tree33729e4b27d416add2fcf4177a34cf09b7913388 /sysdeps/generic/setenv.c
parentc199a24feb079bf0f81f8cedcfe55e99c47ac415 (diff)
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Sun Jul 21 06:48:38 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu>
* sysdeps/generic/setenv.c (__environ): Change conditional for #define from [!HAVE_GNU_LD] to [!_LIBC]. [_LIBC]: Include <libc-lock.h> and define a lock. (LOCK, UNLOCK): New macros, no-ops for [! _LIBC]. (setenv, unsetenv): Use them.
Diffstat (limited to 'sysdeps/generic/setenv.c')
-rw-r--r--sysdeps/generic/setenv.c32
1 files changed, 29 insertions, 3 deletions
diff --git a/sysdeps/generic/setenv.c b/sysdeps/generic/setenv.c
index 7bbd0ac..a84a8eb 100644
--- a/sysdeps/generic/setenv.c
+++ b/sysdeps/generic/setenv.c
@@ -32,10 +32,21 @@ Cambridge, MA 02139, USA. */
#include <unistd.h>
#endif
-#ifndef HAVE_GNU_LD
+#if _LIBC - 0 == 0
#define __environ environ
#endif
+#if _LIBC - 0
+/* This lock protects against simultaneous modifications of `environ'. */
+#include <libc-lock.h>
+__libc_lock_define_initialized (static, envlock)
+#define LOCK __libc_lock_lock (envlock)
+#define UNLOCK __libc_lock_unlock (envlock)
+#else
+#define LOCK
+#define UNLOCK
+#endif
+
int
setenv (name, value, replace)
const char *name;
@@ -47,6 +58,8 @@ setenv (name, value, replace)
const size_t namelen = strlen (name);
const size_t vallen = strlen (value) + 1;
+ LOCK;
+
size = 0;
for (ep = __environ; *ep != NULL; ++ep)
if (!strncmp (*ep, name, namelen) && (*ep)[namelen] == '=')
@@ -66,13 +79,17 @@ setenv (name, value, replace)
new_environ = (char **) malloc ((size + 2) * sizeof (char *));
if (new_environ == NULL)
- return -1;
+ {
+ UNLOCK;
+ return -1;
+ }
new_environ[size] = malloc (namelen + 1 + vallen);
if (new_environ[size] == NULL)
{
free ((char *) new_environ);
errno = ENOMEM;
+ UNLOCK;
return -1;
}
@@ -96,7 +113,10 @@ setenv (name, value, replace)
/* The existing string is too short; malloc a new one. */
char *new = malloc (namelen + 1 + vallen);
if (new == NULL)
- return -1;
+ {
+ UNLOCK;
+ return -1;
+ }
*ep = new;
}
memcpy (*ep, name, namelen);
@@ -104,6 +124,8 @@ setenv (name, value, replace)
memcpy (&(*ep)[namelen + 1], value, vallen);
}
+ UNLOCK;
+
return 0;
}
@@ -114,6 +136,8 @@ unsetenv (name)
const size_t len = strlen (name);
char **ep;
+ LOCK;
+
for (ep = __environ; *ep; ++ep)
if (!strncmp (*ep, name, len) && (*ep)[len] == '=')
{
@@ -124,4 +148,6 @@ unsetenv (name)
while (*dp++);
/* Continue the loop in case NAME appears again. */
}
+
+ UNLOCK;
}